Set default security on web page module. Web pages module should not be accessible by default to anonymouse. Anonymous should only access web pages through their permanent URL within a web site (since only this provides URL stability).

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@15512 20353a03-c40f-0410-a6d1-a30d3c3de9de